MCQ on Class 11 Chemistry Chapter 12 Organic Chemistry Some Basic Principles And Techniques

Questions
1 Which of the following behaves both as a nucleophile and as an electrophile?
A CH3C ≡ N
B CH3OH
C CH2 = CHCH3
D CH3NH2

Answer:CH3C ≡ N
2 A crystalline solid possess which one of the following property?
A Irregularity
B Non- symmetric
C Perfect geometric pattern
D non- stability

Answer:Perfect geometric pattern
3 Inductive effect involves
A displacement of σ electrons
B delocalization of π electrons
C delocalization of σ-electrons
D displacement of π-electrons

Answer:displacement of σ electrons
4 Which element is estimated by Carius method
A Carbon
B Hydrogen
C Halogen
D Nitrogen

Answer:Halogen
5 If there is no rotation of plane polarized light by a compound in a specific solvent, thought to be chiral, it may mean that
A The compound may be a racemic mixture
B The compound is certainly a chiral
C The compound is certainly meso
D There is no compound in the solvent.

Answer:The compound is certainly meso
6 If 0.228 g of silver salt of dibasic acid gave a residue of 0.162 g of silver on ignition then molecular weight of the acid is
A 70
B 80
C 90
D 100

Answer:90
7 Which one of the following conformations of cyclohexane is chiral?
A Twist boat
B Rigid
C Chair
D Boat

Answer:Twist boat
8 The compound Organic Chemistry is known by which of the following names
A Bicyclo-[2, 2, 2] octane
B Bicyclo-[2, 2, 1] octane
C Bicyclo-[1, 2, 1] octane
D Bicyclo-[1, 1, 1] octane

Answer:Bicyclo-[2, 2, 2] octane
9 0.0833mol of carbohydrate of empirical formula CH2O contain 1 g of hydrogen. The molecular formula of the carbohydrate is
A C5H10O5
B C3H4O3
C C12H22O11
D C6H12O6

Answer:C6H12O6
10 In the Dumas method, the nitrogen present in organic compound gets converted to
A Sodium Cyanide
B Gaseoue Ammonia
C Dinitrogen Gas
D Ammonium Sulphate.

Answer:Dinitrogen Gas
11 59 g of an amide obtained from a carboxylic acid, RCOOH, liberated 17 g of ammonia upon heating with alkali. The acid is
A Formic Acid
B Acetic Acid
C Propionic Acid
D Benzoic Acid

Answer:Acetic Acid
12 What is the correct IUPAC name of

Organic Chemistry

A 4-methoxy-2-nitrobenzaldehyde
B 4-formyl-3-nitro anisole
C 4-methoxy-6-nitrobenzaldehyde
D 2-formyl-5-methoxy nitrobenzene

Answer:4-methoxy-2-nitrobenzaldehyde
13 Insulin contains 3.4% sulphur. The minimum molecular weight of insulin is
A 350
B 470
C 560
D 940

Answer:940
14 Which one is strongest acid among following options?
A CH2FCOOH
B CH2ClCOOH
C CHCl2COOH
D CHF2COOH

Answer:CH2ClCOOH
15 An organic compound which produces a bluish green coloured flame on heating in presence of copper is
A Chlorobenzene
B Benzaldehyde
C Aniline
D Benzoic acid

Answer:Benzoic acid
16 Which of the following cannot be represented by resonance structures?
A Dimethyl ether
B Nitrate anion
C Carboxylate anion
D Toluene

Answer:Dimethyl ether
17 The displacement of electrons in a multiple bond in the presence of attacking reagent is called
A Inductive effect
B Electromeric effect
C Resonance
D Hyper conjugation.

Answer:Electromeric effect
18 0.0833mol of carbohydrate of empirical formula CH2O contain 1g of hydrogen. The molecular formula of the carbohydrate is
A C5H10O5
B C3H4O3
C C12H22O11
D C6H12O6

Answer: C6H12O6
19 Identify the chiral molecule among the following:
A Isopropyl alcohol
B 2-pentanol
C 1-bromo 3-butene
D Isobutyl alcohol

Answer:Isobutyl alcohol
20 If two compounds have the same empirical formula but different molecular formula they must have
A Different percentage composition
B Different molecular weight
C Same viscosity
D Same vapour density

Answer:Different molecular weight

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